... a magnetically referenced measurement while drilling tool (MWD) and taken while static, either before, after or sometimes during the connection. The drillstring is often worked to release trapped torque and time is often taken waiting for the survey to be pumped up. All of this consumes rig time and opens...

... Abstract Downhole wireless communication in the form of mud pulse telemetry enabled directional drilling over the past 60 years and has been hugely successful. Technologies like Measurement While Drilling (MWD), Logging While Drilling (LWD), and Geosteering would simply not exist without...

... Abstract Various polyacrylamide polymers have been successfully applied in chemical EOR projects. These polymers are characterised by high molecular weights (MW) to achieve high viscosifying power. The molecular weight distribution (MWD) of the polymers has a major impact on polymer properties...

... simulations with mud weight and flow rate sensitivity cases were done. The actual results were consistent with the planned values and no deviations were recorded. Some additional details are shown in the lessons learnt and the Appendix B . Telemetry and MWD System One the first well in this field...

... describes the framework for determining the accuracy of DDS surveys in terms of wellbore positioning. As measurements are taken while rotating, the standard stationary MWD error model does not apply in all respects. An analysis of drilling efficiency savings is conducted, looking at the rig time savings...

... frequency measuring device is used to validate the theoretical modeling of the stick-slip-HFTO interaction. Field data from the North Sea including surface and MWD measurements are used in a broad study to investigate the influence of operational parameters, bit and formation on the torsional dynamics over...

... to potential cross flow. Detailed measurement-while-drilling (MWD) survey analysis was conducted for the original hole in order to enhance surveys accuracy and minimize positional uncertainty. Typical survey management practices were implemented for Sag and Drilling String Interference; other techniques...

...HFTO-Isolation Tool The principle of isolating torsional vibration is based on mechanical low-pass filtering similar to a dual-mass flywheel ( Schulte 1986 , Schnurr 1990 ). The HFTO-isolation tool as described in ( Heinisch et al. 2018 ) prevents high acceleration amplitudes from HFTO at MWD...

... Figure 3 presents the new generation MWD surveys at stationary stations compared to the stationary surveys of a conventional MWD tool. Inclination from the conventional MWD tool is plotted in green and azimuth is plotted in purple. The new generation MWD surveys were taken several surveys...

... are measured to a borehole reference frame. The change in azimuth is then derived by various approximations. The joining structure is assumed to coincide with the longitudinal axis of the borehole in MWD. In the conventional approach of the change in azimuth determination between the two sensor tools using...

... The most popular of these methods is mud-pulse telemetry ( Gearhardt et al, 1981 ). This can be either a positive pulse (increase in pressure), a negative pulse (reduction in pressure), or a continuous wave (sine wave) signature ( Hutin et al, 2001 ). All pulses travel from the MWD tool through...

... analysis (MSA). In-Field Referencing (IFR) Technique Abstract Safe and economical determination of wellbore trajectory in directional drilling is traditionally achieved by measurement-while-drilling (MWD) methods which implement magnetic north-seeking sensor packages. However, inaccuracies...

... to the drilling operations problem in real time. The majority of the drilling bottomhole assemblies (BHAs) consist of drive systems containing a positive displacement motor or rotary steerable system (RSS) and measurement-while-drilling (MWD) tool. The MWD tool includes the survey package that measures...

...-of-the-art, we turned our design engineers on specific implementation and qualification tasks. Our Reliability Engineering and Production, Manufacturing & QA Engineering personnel began filling-in the details on our plans for qualifying and building production 200°C MWD tools. The final version...

... is surveyed by plane, and this data is then used as the basis of a local magnetic map from which true magnetic parameters can be taken. This data is used at the rig site in the MWD/LWD surface system initialization. The local crustal anomalies in the field are measured and the crustal maps are in use...

... The actuation of the underreamer (e.g., via ball drop) causes the fluid to split into two flow paths. The first flow path travels around the ball, out of the bore through the second end portion of the body, and into the MWD tool. This is similar to the flow path of the fluid when the underreamer...

... downhole, then uses a measurement-while-drilling (MWD) tool to send selected and critical parametric information to surface. Furthermore, bi-directional capability allows parameter formats to be updated throughout the job. A great deal of learning has been acquired from operating the new system, mostly...